Quote:
Originally Posted by Ether
@ prgramerdude: Please elaborate.
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The ideal motor equations don't always hold up in the real world. Every motor in the FRC context has some internal friction that opposes rotation. Thus, while a non-spinning motor may be able to prevent another from moving in certain cases, it could also have enough friction, and thus torque, to prevent another motor from moving.
High gearing stages on said non-moving motor would amplify this effect (Have you ever tried spinning a CIM connected to a tough box via the tough box output shaft?). If the motor happens to be non-moving, like it was stated in the original post, then the static friction from such a motor could prevent movement. It also could easily slow down a running motor, even with open leads, although the how-much depends on context.
Although, I do agree with the original's rough intent: the back-EMF from a motor shorting into itself DOES NOT apply to a non-moving motor (no EMF overall), and so brake/coast mode does not apply. The "motor", though, isn't just an electrical energy transducer.